How to Transform JSON into GeoJSON for GIS Software

Learn how to efficiently `append items from JSON` and structure them to create a `GeoJSON` dictionary that GIS software can accept.
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This video is based on the question https://stackoverflow.com/q/76263059/ asked by the user 'Guziko' ( https://stackoverflow.com/u/15633898/ ) and on the answer https://stackoverflow.com/a/76263210/ provided by the user 'JonSG' ( https://stackoverflow.com/u/218663/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Transforming JSON Data into GeoJSON for GIS Software

In the world of geographic information systems (GIS), the need to convert various data formats is common. One such transformation that many data scientists and developers encounter is converting a JSON dictionary into a GeoJSON format, which is an accepted structure in GIS applications. If you've been struggling with this process, you're not alone. In this guide, we'll break down how to transform a simple JSON file into a GeoJSON dictionary, ensuring it's correctly formatted and ready for use in GIS software.

The Problem Statement

You may start with JSON data structured like this:

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The goal is to transform it into a GeoJSON format, which has a predefined structure like so:

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The Solution Explained

In order to achieve this transformation, we need to modify the original code slightly. The core issue arises from the fact that properties were being overwritten during each iteration over the original JSON data. We can resolve this by appending new features to the features list instead.

Step-by-step Breakdown

Read the JSON Data: Start by loading your JSON file.

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Initialize the GeoJSON Dictionary: Create a new dictionary that follows the GeoJSON structure.

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Iterate Over Properties: Loop through each item in the properties list of the JSON data. Instead of overwriting the existing properties, append a new feature to the features list.

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Dump the GeoJSON to a File: Finally, export your newly structured GeoJSON into a file.

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Print the Result: Optionally, you can print the GeoJSON to verify its structure manually.

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Sample Code

Below is the complete code after adjustments:

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Conclusion

Transforming your JSON data into the GeoJSON format is a matter of simple adjustments in your code. By appending new features to the features list rather than overwriting them, you can create a well-structured and GIS-compatible GeoJSON dictionary. With this guide, you should be able to handle similar transformations with ease in the future. Happy coding!

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